linux-kernel - [PATCH] usb: core: Unregister device on component

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220208170048.24718-1-fmdefrancesco@gmail.com>
Date:   Tue,  8 Feb 2022 18:00:48 +0100
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        syzbot+60df062e1c41940cae0f@...kaller.appspotmail.com
Subject: [PATCH] usb: core: Unregister device on component_add() failure

Commit 8c67d06f3fd9 ("usb: Link the ports to the connectors they are
attached to") creates a link to the USB Type-C connector for every new
port that is added when possible. If component_add() fails,
usb_hub_create_port_device() prints a warning but does not unregister
the device and does not return errors to the callers.

Syzbot reported a "WARNING in component_del()".

Fix this issue in usb_hub_create_port_device by calling device_unregister()
and returning the errors from component_add().

Reported-by: syzbot+60df062e1c41940cae0f@...kaller.appspotmail.com
Fixes: 8c67d06f3fd9 ("usb: Link the ports to the connectors they are attached to")
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---
 drivers/usb/core/port.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index c2bbf97a79be..8455b235976a 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -605,8 +605,11 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
 	find_and_link_peer(hub, port1);
 
 	retval = component_add(&port_dev->dev, &connector_ops);
-	if (retval)
+	if (retval) {
 		dev_warn(&port_dev->dev, "failed to add component\n");
+		device_unregister(&port_dev->dev);
+		return retval;
+	}
 
 	/*
 	 * Enable runtime pm and hold a refernce that hub_configure()
-- 
2.34.1